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Goodwill and other intangible assets, net (Tables)
 6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Operating Segments
In millionsPerformance ChemicalsPerformance MaterialsTotal
December 31, 2019$432.1  $4.3  $436.4  
Foreign currency translation(20.7) —  (20.7) 
June 30, 2020$411.4  $4.3  $415.7  
Schedule of Finite-Lived Intangible Assets
June 30, 2020December 31, 2019
In millionsGrossAccumulated amortizationNetGrossAccumulated amortizationNet
Intangible assets subject to amortization
Customer contracts and relationships$303.7  $61.6  $242.1  $314.5  $51.6  $262.9  
Brands (1)
75.8  13.2  62.6  80.3  11.1  69.2  
Developed technology66.5  8.3  58.2  68.6  5.7  62.9  
Other2.7  1.9  0.8  2.7  1.5  1.2  
Total Other intangibles, net$448.7  $85.0  $363.7  $466.1  $69.9  $396.2  
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(1) Represents trademarks, trade names and know-how.

At June 30, 2020 and December 31, 2019, the intangible assets subject to amortization were allocated among our business segments as follows:

In millionsJune 30, 2020December 31, 2019
Performance Chemicals$361.5  $396.2  
Performance Materials2.2  —  
Total Other intangibles, net$363.7  $396.2  
Finite-lived Intangible Assets Amortization Expense The amortization expense related to our intangible assets in the table above is shown in the table below.
Three Months Ended June 30,Six Months Ended June 30,
In millions2020201920202019
Cost of sales$—  $0.1  $0.1  $0.3  
Selling, general and administrative expenses7.9  7.3  16.1  12.6  
Total amortization expense(1)
$7.9  $7.4  $16.2  $12.9  
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(1) See Note 4 for more information about the Caprolactone Acquisition, and the related increase in amortization expense.